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Related Experiment Videos

Aortic input impedance in heart failure.

C J Pepine, W W Nichols, C R Conti

    Circulation
    |September 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Heart failure patients exhibit stiffer aortas, indicated by increased input resistance and characteristic impedance. This aortic stiffening elevates wave reflections, potentially impacting the failing left ventricle's function.

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    Area of Science:

    • Cardiovascular Physiology
    • Biomedical Engineering
    • Clinical Medicine

    Background:

    • Systemic circulation input impedance analysis provides insights into cardiovascular mechanics.
    • Heart failure is associated with significant alterations in cardiac and vascular function.

    Purpose of the Study:

    • To investigate the input impedance of the systemic circulation in patients with heart failure.
    • To determine if aortic distensibility and wave reflections are altered in heart failure.

    Main Methods:

    • Calculated input impedance from pulsatile pressure and flow recordings in the ascending aorta.
    • Compared impedance parameters between 10 heart failure patients and 10 healthy control subjects.

    Main Results:

    Related Experiment Videos

    • Heart failure patients showed significantly increased input resistance and characteristic impedance (aortic distensibility).
    • Oscillations in impedance moduli were significantly higher in heart failure patients, indicating increased wave reflections.

    Conclusions:

    • The human aorta is stiffer in heart failure, evidenced by increased characteristic input impedance.
    • Elevated wave reflections in heart failure may influence the pulsatile function of the failing left ventricle.